JPS5882235A - Automatic focusing method and interchangeable optical device and main body of optical device used therefor - Google Patents

Abstract

PURPOSE:To obtain an interchangeable optical device easy to use, by inverting the driving direction of a driving part in the optical device body in accordance with a signal corresponding to the driving direction of a following-up part of the interchangeable optical device and driving a focusing part of the interchangeable optical device in a proper direction by the driving part in the optical device body side. CONSTITUTION:When a main switch is closed, a light receiving part 5 detects the focus state of a photographic lens 32 passing through an auxiliary mirror 3 and inputs its information to an operating circuit 6. Since a signal detecting switch 38 is turned off, the operating circuit 6 gives a signal, which indicates a driving direction in accordance with the normal operation result based on information from the light receiving part 5, to a motor driving controlling circuit 7 to rotate a motor normally or reversely. If an object is in the state of rear focus, the signal to rotate normally a motor 8 is issued, and a driving shaft 9 is rotated counterclockwise, namely, to the right in figure, and a following-up shaft 25 is rotated clockwise through gears 10 and 24 to rotate a helicoid cylinder 29 clockwise through a transmission gear 34 and an internal gear 33, and a photographic lens 32 is moved to the left in figure.

Description

Detailed Description of the Invention Technical Field This invention relates to a case where an automatic focusing mechanism in a camera with interchangeable lenses performs an automatic focusing operation by driving a driven section on the interchangeable lens side by a driving section provided on the camera body side. The present invention relates to an automatic focusing method performed by driving an exchangeable optical device side driven section upstream of an optical device main body side driving section, and an exchangeable optical device used in the method, and an optical device main body.

Conventional technology For example, for automatic focusing, a camera body is equipped with a light receiving section, an arithmetic circuit, a motor, a motor drive control circuit, a drive shaft, etc., and detects the state of image formation by an interchangeable lens, and detects whether the state of focus has yet been reached. Techniques for determining in which direction the optical system should be moved and instructing the moving direction for focusing the optical system are already known, only when it is determined that the optical system is not present. In this case, the direction instruction is actually an instruction for driving the motor in the forward or reverse direction, and as the motor rotates in the specified direction, the drive gear rotates, which causes the driven gear on the interchangeable lens side to rotate. The rotation is transmitted from the driven part to the focus adjustment part, and the focusing operation is automatically performed. However, since there are many types of interchangeable lenses that are driven by the motor, the focus adjustment section for the operating direction of the driven section on the interchangeable lens side that is rotated by the drive section on the camera body side for automatic focusing is necessary. It is difficult to unify the driving direction of the lens, that is, the driving direction of the direction in which the driven part is rotated to adjust the focal point toward infinity, which is the focusing direction.

In other words, when manufacturing an interchangeable lens barrel, for example, one position of the driven part according to the aperture of the interchangeable lens is applied, and the rotation given to the rotating part is used to move the optical system through the meshing of a pinion and an internal gear. The driving force is transmitted to the optical system moving mechanism through the engagement between the pinion and the external gear.Due to the difference in the driving force transmission format, the driving direction for automatic focusing can be reversed. Become.

In order to standardize this, it would be necessary to reduce the types of interchangeable lenses capable of autofocusing, for example to those within the same aperture range, or increase the number of gear trains to those with opposite drive directions. If an attempt is made to maintain a normal relationship, the mechanism will become complicated and the product will become larger. In addition, this will lead to an increase in manufacturing costs, an increase in the failure rate, and a decrease in driving force transmission efficiency.In addition, the orientation of the helicoid screw in the optical system moving mechanism may be changed so that the driving direction is in a normal relationship or not. If the method is reversed, the number of lead cams (master cams) and the like of the helicoid screw processing machine must be increased, and a processing line corresponding to the direction of the screw must be installed. Furthermore, in an interchangeable lens that has both automatic focusing operation and manual focusing operation, the operating direction for manual focusing differs depending on the model and may be unified.
There is a problem in that when the camera hits a shadow, it becomes confused in the direction of the merging operation, and as a result, the photo opportunity is missed.

Also, if the drive direction of the interchangeable lens focus adjustment unit is not unified, focusing may become impossible depending on the type of camera body, and the camera body may be unable to recognize the drive direction by driving the photographic lens on a trial basis. If a method is adopted in which the focus is shifted to true automatic focusing, problems such as a significant increase in the time required for focusing will occur.

Purpose: This invention reverses the driving direction of a drive section on the main body side of an optical device in response to a signal corresponding to the driving direction of the driven section of the replacement optical device, and changes the focus adjustment section of the replacement optical device to the direction of the drive section of the optical device. KL so that it is driven in the proper direction by the main body side drive unit,
To provide an automatic focusing method in which a focus adjustment section on an exchangeable optical device side is driven by a drive section on an optical device main body side, which can eliminate the various drawbacks of the conventional art, and an exchangeable optical device and an optical device main body used in the method. The purpose is to

Embodiment The embodiment shown in FIGS. 1 and 2 will be explained as follows.
1 is the camera body of a single-lens 7-rex camera, and -2
is a main mirror, 3 is an auxiliary mirror, and 4 is a film. In addition, for automatic focusing, the camera body an arithmetic circuit 6 that determines in which direction the system should be moved; a motor drive control circuit 7 that rotates the motor 8 forward, reverse, or stops in response to a signal corresponding to the determination from the arithmetic circuit 6; Furthermore, a motor 8 controlled by a motor drive control circuit 7, a drive shaft 9 connected to the motor 8 via a deceleration mechanism (not shown), and a drive gear 1° on the drive shaft 9 are provided.

This camera body IK is attached with an interchangeable lens 2o having a large lens aperture in FIG. 1, and an interchangeable lens 21 having a small lens aperture in FIG. Each interchangeable lens 2
0.21, a mount 22 for detachably attaching to the camera body IK is provided integrally with each fixed tube 23, and a lens 20.21 is attached to the camera body 1 at a position around the outer circumference of the mount 22. The drive shaft 9 and the driven shaft 25 are parallel to the optical axis 26, and are provided with a driven shaft 25 having a driven gear 24 that meshes with and disengages from the drive gear IO as it is attached to and detached from the drive gear IO.

Further, 27 is an inner cylinder for holding the lens, and is a helicoid cylinder integrated with a manual focusing operation ring 28, and a helicoid male screw 27a is screwed into a helicoid female screw 29 & of 29. Helicoid male screw 29b of helicoid tube 29
The helicoidal female screw 23a of the fixed cylinder 23 is screwed into the . Further, a key groove 30 in the optical axis direction is formed in a part of the outer part of the inner cylinder 27, and engages with a key 31 fixedly installed in a part of the inner circumference of the fixed cylinder 23, thereby moving the inner cylinder 27 in the direction of the optical axis 26. As a result, when the helicoid cylinder 29 is rotated by the manual focusing operation ring 28 or by the transmission from the driven shaft 25, the inner cylinder moves according to the direction of rotation. 27 is moved forward or backward in the direction of the optical axis 26 to perform a focus adjustment operation. Now, specifically, the helicoid screw 37a,
29a is a left-handed screw, and helicoid screws 23a and 29b are right-handed screws. When the helicoid tube 29 is rotated clockwise when viewed from the rear (right side in the figure), the inner tube 27 is rotated to the left in the figure. It is intended to be moved.

However, since the first illustrated interchangeable lens 20 holds the photographing lens 32 with a large diameter in the inner tube 27, the helicoid tube 29 has a large diameter as well as the inner tube 27. The internal gear 33 formed in
The transmission gear 34 on the 2S is engaged so that the transmission from the driven shaft 25 is increased, thereby effectively utilizing the space inside the lens barrel. holds a photographing lens 35 with a small aperture,
Since the helicoid tube 29 has a small diameter as well as the inner tube 27, the transmission gear 34 on the driven shaft 25 is meshed with the external gear 36 formed at the rear end of the helicoid tube 29. The transmission is removed, and the extra space outside the helicopter tube 29 is utilized.

As described above, due to the difference in the transmission structure from the driven shaft 25 to the helicoid cylinder 29, even if the driven shaft 25 receives rotation in the same direction, the inner cylinder /29 of the first interchangeable lens 21 and the second
The inner cylinder 29 of the illustrated interchangeable lens 22 is driven in directions opposite to each other. Therefore, the driving direction of the inner cylinder 27 with respect to the rotational direction of the driven shaft for automatic focusing is 1 camera body l.
With respect to the drive direction of the drive shaft 9 prepared for this purpose, if one side is in a normal relationship, the other side is in an opposite relationship. In the opposite relationship, even if the drive shaft 9 is driven in the direction determined by the arithmetic circuit 6 on the camera body l side, the lens system is moved in the opposite direction to the focusing direction, making it impossible to focus. becomes.

In order to unify the driving direction, it is sufficient to provide one gear between the transmission gear 34 and the external gear 36, and in the example shown in FIGS. Although it seems that there are no problems with the space or the resulting increase in the size of the product, it is definitely not possible to do so, in reality.
Due to reasons such as design, processing, and assembly, the bell body is made up of more parts, and is also equipped with an automatic tightening device and various signal means other than those of the present invention. The ongoing miniaturization of products and the corresponding reduction in the length of lenses (diameters do not become much smaller) are making the space situation even more difficult.
1 is provided with a drive direction signal corresponding to the drive direction of the driven shafts, and when the lens 20, 21 is attached to the camera body 1, the drive direction of the drive shaft 9 is automatically switched between forward and reverse according to the signal. In this way, automatic focusing is performed normally in both cases where the driven shaft drive direction is normal and vice versa.

In practice, the forward drive direction of the drive shaft 9 should be set so that the driven shaft drive direction handivity of the general rock type, which has the highest production volume, has a normal relationship. Think of the fact that there is no direction signal as a type of signal,
Because it is advantageous to use it in terms of cost and durability,
In the l'h embodiment, as mentioned above, the first model is a general model.
The illustrated interchangeable lens 20 is not provided with a special driving direction signal, and its mount 22 is directed toward the second illustrated interchangeable lens 21.
A signal pin 37 is provided rearwardly projecting from the rear end surface to serve as a signal indicating that the driven shaft drive direction is in an opposite relationship to the drive direction of the drive shaft 9.

On the other hand, the camera body l is provided with a signal detection switch 38 as a means for detecting the signal of the interchangeable lens 20.21 attached thereto, and the interchangeable lens 20.
When the interchangeable lens 21 with the signal bottle 37 is attached (Figure 2), it is in the off state and the signal is in the on state. The on/off signal of the detection switch 38 is given to the arithmetic circuit 6, and when the switch 38 is off, the arithmetic circuit 6 gives a drive direction signal according to the normal calculation result to the motor drive control circuit 7, and the switch 38 is on, a drive direction signal which is an inversion of the normal calculation result is given to the motor drive control circuit 7.

The helicoidal screws 23a and 29bidlJ are made extremely small, and the optical axis 2 corresponds to the amount of rotation of the internal gear 33 and the external gear 36 during the focusing operation.
Reduce the amount of movement in six directions to stabilize operation.

The operation will be explained below. In FIG. 1, when the main switch (not shown) is closed, the light receiving section 5 is connected to the auxiliary mirror 3.
The imaging state of the photographic lens 32 is detected, and the information is input to the arithmetic circuit 6.

Since the signal detection switch 3t's is in the off state, the arithmetic circuit 6 sends a drive direction signal to the motor drive control circuit 7 according to the normal calculation result based on the information from the light receiving section 5.
to rotate the motor 8 forward or reverse. Now, assuming that the subject is closer, that is, in the case of the rear bin, a drive direction signal is issued to rotate the motor 8 in the forward direction, and the drive shaft 9 is rotated in the opposite direction when viewed from the rear (right side in Figure 1). rotated clockwise.

As a result, the driven shaft 25 is rotated clockwise via the gear 10.24, and the helifit cylinder 29 is rotated clockwise via the transmission gear 34 and the internal gear 33.

Therefore, the inner cylinder 27 and the photographing lens 32 are moved to the left in FIG. 1 by the right-handed helicoid screws 27a, 29a and the left-handed helicoid screws 2B&, 29b.

As the photographing lens 32 moves, the imaging state detected by the light receiving unit 5 changes moment by moment to a focused state, and when the focused state is reached, the arithmetic circuit 6 sends a motor stop signal to the motor drive control circuit i7. As a result, the motor 8 is stopped. In reality, there is a slight time lag between detection of focus and the stopping of the photographing lens 32, and various countermeasures have been taken to deal with this, but illustrations and explanations are omitted as they are not the main idea of this invention.

In FIG. 2, since the signal detection switch 38 is in the on state, the arithmetic circuit 6 provides the motor drive control circuit 7 with a drive direction signal that is an inversion of the normal calculation result based on the information from the light receiving section 5. Now, as in the case of Fig. 1, assuming that the subject was closer, a drive direction signal is issued to reverse the motor 8, contrary to the above, and the drive shaft 9 is moved backward (Fig. 1). The driven shaft 25 is rotated in the opposite clockwise direction when viewed from the right side), and the driven shaft 25 is also rotated in the opposite direction counterclockwise. However, the counterclockwise rotation of the driven shaft 25 is caused by the rotation of the helicoid tube 2 through the transmission gear 34 and the external gear 36.
9 is transmitted clockwise.

Therefore, since the helicoid tube 29 is rotated clockwise as in the case of FIG. 1, the photographing lens 35 is moved to the left in the figure by the helicoid screws 27m, 29a, 23a, and 29bK.

Therefore, in this case as well, due to the movement of the photographic lens 35, the image formation state detected by the light receiving section 5 changes moment by moment to the focused state, and when the focused state is reached, the motor stop signal from the arithmetic circuit 6 is activated. Motor 8 is stopped.

As described above, no matter which of the two types of interchangeable lenses with opposite driven shaft drive directions are attached to the camera body, the camera body side drive Automatically reversing the drive direction of the shaft eliminates the hassle of having to operate the drive shaft on the camera body side each time an interchangeable lens is attached to the camera body in order to know the drive direction of the driven shaft.
This eliminates the need for preparation time and allows automatic focusing to be taken at the same time as the interchangeable lens is attached.

The presence or absence of the signal pin 37 as a signal indicating the driving direction of the interchangeable lens 20.21 is determined by the interchangeable lens 20.21.
It acts as a mechanical signal based on the dimensional or positional relationship with respect to the body L side when the camera body L is attached to the camera body L, and not only is the signal provided to the body L side fixed, but also the driving direction is controlled. There is an advantage in that it is sufficient to make a dimensional or positional change only to one of the two mutually opposite interchangeable lenses. The signal format and the specific configuration of the detection means on the body 1 side for the signal format may be changed in various ways.

It goes without saying that each interchangeable lens 20, 21 can be manually focused using a manual focusing ring 28; in this case, the main switch (not shown) can be operated with the main switch open.

The ring 28 is used for both interchangeable lenses 20 and 21.
Since it rotates integrally with the recoid cylinder 29, the focusing operation direction is the same.Therefore, during actual photography, there is no follower.

There is no problem when using a lens that has a habit of rotating its axis.

In the case of the embodiment shown in FIGS. 3 to 5, the camera body 41 has connection terminals 7a and 7b between the motor drive control circuit 7 and the motor 8, as shown in FIG.

ga and gb are placed on the lens mount surface 41 &. On the other hand, the interchangeable lens 42 (FIG. 3) in which the driven shaft drive direction is in a normal relationship, and the interchangeable lens 43 (FIG. 4) in the opposite relationship, are attached to both the mounting surface 44 and the body 41. When the terminals 7a, 7b, 8 are attached, the terminals 7a, 7b, 8
Signal terminals 42a*42b, 42o connected to a, 8b
, 424 (Figure 3) and 43&+43b+43c+4
3d (Fig. 4) is arranged.

Each terminal 42a...42d in the interchangeable lens 42 is
The terminals 42a and 424, 42'b and 420 are connected, and when the interchangeable lens 42 is attached to the camera body 41, the terminals 7a and 8&, and the terminals 81) on the body 41 side are connected, and the motor 8 On the other hand, each terminal 43m...436 of the interchangeable lens 43 is driven in the direction according to the normal calculation result in the calculation circuit 6, whereas the terminals 43a and 43 (1% 43'b and 4311 are connected). ,
When the interchangeable lens 43 is attached to the camera body 41, the body 41 (terminals 7 & and 81 of 1111) I'm trying to make it happen.

Here, each terminal 42 &... of each interchangeable lens 42, 43 is connected.
The 421st group and 43&...431st group are interposed between the motor 8 and the motor drive control circuit 7, and are connected to each interchangeable lens 4.
It constitutes an electrical signal means that directly acts to change the drive direction of the motor 8 in forward and reverse directions corresponding to the drive direction of the driven shaft in 2.43, and is accompanied by member operations such as turning on and off switches. do not have. Therefore, failures in the signal exchange unit between the interchangeable lens and the camera body are less likely to occur.

45 is a power supply, and 46 is a main switch.The embodiments shown in Figs. 6 to sJ9 have the terminal configuration of the signal exchange section halved compared to the embodiments shown in Figs. 3 to 5. . That is, in the camera body 51, a motor rotation direction reversing circuit 52 is inserted between the motor drive control circuit 7 and the motor 8 (FIG. 8).
The driving direction of the motor 8 is automatically reversed, depending on whether a pair of terminals 52a and 52b disposed on the camera body lens mount surface 51& is closed.

The interchangeable lens 53, which has a positive drive direction, has a pair of terminals 5S&, 53b, which are opposed to the terminals 52m, 52b, arranged on its mounting surface 54 in a mutually insulated state (FIG. 6). , when the interchangeable lens 53 is attached to the Medi 51iC, the terminal 51& is connected to the terminal 52&, the terminal ssb is connected to the terminal 521), and each terminal 52a, 52
An insulating relationship is ensured between b and b. Therefore, instead of the terminals 53m, 53b, the interchangeable lens 53@ uses the entire surface of the mount surface 54 or the area that contacts the body side terminals sza, szb as a mere insulating surface, or uses a metal mount as the terminal 52m, ! of the surface 53&! Similar results can be obtained even if the portion facing the terminal 52b is made into a recess so as to come into contact with the terminals 52a and 52b.

On the other hand, the interchangeable lens 55 having the opposite driving direction has the terminals 52s,
A pair of terminals 55 & facing 5To.

551) are arranged in a connected state with each other (Fig. 7) 1. When the interchangeable lens 55 is attached to the body 51, the terminals 55&
are connected to the terminal 52&, and the terminal 55'b is connected to the terminal 52b, so as to close the connection between the terminals 52a and 52b. Therefore, the entire surface of the interchangeable lens mount surface 56 is connected to the body side terminal 521°521+. Similar results can be obtained even if the opposing ranges are made conductive, and the terminals 55m and 55b can be omitted. When making the entire surface conductive, it is desirable to pay attention to the presence or absence of noise.

A specific example of the motor rotation direction reversing circuit 52 in FIG. 8 is shown in FIG. 9.

In FIG. 9, 57 is a signal control circuit, and the terminal 5
Connected to 2a and 52b. Interchangeable lens 53 or 5
5 terminals 53m, 53bs and terminals 155m, 55b
The system responds to differences in signals due to

This signal control circuit 57 includes exclusive OR circuits 58, 59,
NANI) circuit 60, AM! One circuit consists of 61.62. Further, 63 is a motor drive circuit that drives the motor 8 by reversing it in forward and reverse directions according to the output signal from the signal control circuit 57, and includes transistors 4, 65, 66, 67, and transistors 64.67 for reversing the motor drive direction. 65
Control F-range star 8, 69, resistor 70, 71, 7
2.73, the output of the 5N'D circuit 61 is applied to the base of the transistor 64, and the output of the %AN11 circuit 62 is applied to the base of the transistor 65. ? 4, 75, and 76 are other adjustment resistors.

Now, when the interchangeable lens 53 is attached to the camera body 51, the terminals 52a and 52b of the body 51 are in an insulating relationship, so if the main switch 46 is closed, each input terminal 58b and 59b of the exclusive OR circuit 58 and 59 The input signal to is 111. On the other hand, when the subject is at a closer distance, that is, when the subject is in the rear bin, in order to advance the photographic lens, one output terminal 70 of the motor drive control circuit 7 outputs 111, and the other output terminal 7d outputs 101. A signal is output from each exclusive OR circuit 1) 8.59 input terminal 58 &
#59 & given. From this K, the signal control circuit 57
The outputs from the AND circuits 61 and 62 are 101 and 119, respectively. Therefore, transistor 69.6
15 is turned on, transistors 68 and 64 are turned off, and the current from the power source 45 flows from the transistor 65 to the motor 8 and the transistor 66, so that the motor 8 is rotated in the normal direction and the photographing lens is outputted.

When the subject is far away, that is, when the subject is in the front bin, the output terminals 70 and 7d of the motor drive control circuit 7
to the input terminals 58a of each exclusive OR circuit 58, 59,
Contrary to the above, the signal given to 59m is '0''l', and the outputs from AN11 circuits 61 and 62 are 1, respectively.
It becomes 11 and woI.

Therefore, the transistors 68 and 64 are turned on and the transistors 69 and 65 are turned off, and the current from the power supply 45 flows to the transistor 64, the motor 8, and the transistor 67.
The motor 8 is reversely rotated and the photographing lens is retracted.

When in focus, each output terminal 7o, 71! of the motor drive control circuit 7! ＠□II01 or J＠ respectively.
By outputting the Jl signal, each AND circuit 61
．． The outputs from 62 are @ 0 @ 1 □ m, respectively. Therefore, the transistors 68.64 and t-transistor 9.65 are both turned off, the power supply to the motor 8 is cut off, and the motor 8 is stopped.

Next, when the interchangeable lens 55 is attached to the camera body 51, the terminals 52a and 52 on the body 51 side are connected to the lens 55.
It is closed by connecting with side terminals 55a and 55b.

From this K, each exclusive OR circuit! Contrary to the case of the interchangeable lens 53, an input signal of 101 is applied to each input terminal 58 of 58.59 (1.591) at the same time as the main switch 46 is closed. Therefore, the driving direction of the 1 motor 8 is automatically reversed, and normal automatic focusing operation is performed even for the interchangeable lens 55 whose driven shaft driving direction is opposite.

Note that the example of the nail in FIG. 9 is the first example of the nail 1.
Figure, 2nd v! It can be easily applied to the embodiment of J.

In the embodiment shown in FIGS. 1O to 12, the drive shaft 82 on the camera body 81 side and the interchangeable lens 83 have a normal relationship in the drive direction, and the interchangeable lens 84 has the opposite relationship.
This shows the case of a camera in which driven shafts 85 and 86 are brought into butt engagement with each other on the same axis to transmit driving force via a dog clutch formed at the end of the shaft.

The driven shaft 85 of the interchangeable lens 83 whose driving direction handivity is in a normal relationship as shown in FIG. The retraction dimensions, L, of the clutch parts 85m and 86a from the mount surface 87 of each interchangeable lens 83 and 84 are made to be different (in the example, J>L,
)ing. On the other hand, the drive shaft 82 provided in the camera body 81 has a movable contact piece 89 & so that the end engagement clutch portion 82a protrudes from the lens mounting surface 8B.

89'b is biased to the left in the drawing by the spring properties of 89'b (separate springs may be provided for this purpose), and when body IK interchangeable lenses 83 and 84 are attached, until the attachment is completed. The clutch portion 821 is pressed against the spring by the mount surface 87, but when the mounting is completed, the clutch portion 82& faces the concave portion 87a of a portion of the mount surface 87 where the driven shaft rear end clutch portion 85& or 86& is located. Then, the pressure by the mount surface 87 is released, and the clutch portion 82& is engaged with the driven shaft rear end clutch portion 85a or 86aic by the spring bias. Therefore, the drive shaft 82 Depending on which of the rear end latch portions 85a and 86m of the driven shaft is engaged, the mount surface 88 may be disposed as shown in FIGS. 10 and 11.
The amount of protrusion is different. 9% The axial position of the drive shaft 82 is different. Therefore, a switch 89 is provided which can be switched according to the change in the axial position of the drive shaft 82, and the motor drive control circuit 7 and the motor 8 are connected to each other as shown in FIG. An interchangeable lens 83 inserted between the camera body B1 and attached to the camera body B1.
Alternatively, depending on the drive direction of the motor 84, the drive direction of the motor 8 can be automatically rotated Kff. 90 is a passive gear, and 91 is a maximum protrusion position regulating collar.

In this embodiment, as in the first embodiment, the difference in the driving direction of the interchangeable lens is given to the camera body by a mechanical signal based on the dimensions of a part of the interchangeable lens.
Since the mechanical signal is obtained by the position of the reversing clutch portion of the existing driven shaft, there is no need to provide a special mechanical signal member such as the signal pin in the first embodiment. It's advantageous.

Note that since the power transmission between the drive shaft 82 and the driven shafts 85 and 86 is due to clutch engagement K, the drive shaft 82 rotates clockwise when viewed from the rear (right side in the figure). Take the direction. The switch 89 connects the motor and drive control circuit 7I to each output terminal 7a, ? It consists of interlocking movable contact pieces 89 i, 89'b connected to the motor 8, fixed contact pieces 89 o H89a s on the forward/reverse normal side of the motor 8, and fixed contact pieces 89 e, 89 f on the opposite side of the forward/reverse direction of the motor 8. When the interchangeable lens 83 is attached in a normal relationship, the movable contact pieces 89m and 89b contact the normal fixed contact piece 89C989 (1) as shown in FIGS. 60, when the interchangeable lens 84 with the opposite drive direction is attached, the first
As shown in Figure 1, the movable contact pieces 89a and 89b are the fixed contact pieces 8 on the reverse side.
9e and 89flfC contact to switch the drive direction of the motor 8 between forward and reverse. Only the signals representing the relationship and the forward/reverse reversal of the motor driving direction are described here. However, in actual products, interchangeable lenses that do not have a driven shaft are also used, so in addition to identifying the driving direction of the driven shaft, it is also necessary to identify whether or not the driven shaft is installed. Only in the case where the motor has a motor drive direction, identification of the drive direction and switching of the motor drive direction between forward and reverse is performed. In this case, a separately provided signal indicating the presence or absence of the driven shaft may be used, but a three-stage signal is obtained by adding a signal depending on the presence or absence of the driven shaft to the two-stage mechanical or electrical signal in each of the above embodiments. As a result, automatic reversal of the motor driving direction can be performed only for the motor K having a driven shaft.

For example, in order to obtain the three-stage signal, as shown in FIG.

In the embodiment shown in FIG. 2, another signal bin having a different height from the signal pin 37 is provided on an interchangeable lens without a driven shaft and identified by a gray hood on the camera body side, or the other signal bin is identified by a gray hood on the camera body side. It is sufficient to provide a normally closed switch that is opened only by the camera body in series with the main switch.

Also, from Figure @3, in the flE5M example, the mounting surface of the interchangeable lens without a driven shaft is W! - It is sufficient to have no connecting terminal, and it is preferable to use an insulating surface. In the case of the embodiments shown in FIGS. 6 to 9, one body side terminal 52 is attached to the lens 24 surface of an interchangeable lens without a driven shaft.
A high-resistance conductive part that provides an appropriate resistance value may be provided between a and 52b, and the autofocus function may be stopped when the specific resistance value is detected due to the circuit configuration on the camera body side. In addition to stopping the function, a warning can also be displayed in a location that is easily noticed by the camera user, such as within the field of view of the viewfinder, to remind the camera user to turn off the main switch of the autofocus device.

In the embodiments shown in Figures 10 to 12, the mount surface of the interchangeable lens representing the driven shaft is provided with a recess that is deeper than the dimensions shown in Figure 1O, so that the drive shaft protrudes further due to the absence of the driven shaft. A normally closed switch that is opened only when the drive shaft protrudes to its maximum extent may be provided in series with the main switch.

Furthermore, the present invention also includes the use of read-only memory (hereinafter referred to as ROM) as one of the signal formats. That is, an interchangeable lens KROM and an input/output means I for the interchangeable lens are provided, and information on the driving direction of the interchangeable lens having the KROM or information corresponding to the presence or absence of a driven shaft is digitally stored in the ROM. , the information processing device on the camera body side via the connection terminal on the mount surface uses the stored information to automatically switch the motor drive direction forward or reverse depending on the drive direction of each interchangeable lens, or without a driven shaft. In some cases, the autofocus function may be disabled.

In addition, as optical equipment bodies to which this invention is applicable,
In addition to the above-mentioned still camera, examples include various optical devices that require focus adjustment, such as movie cameras such as 8 mm cameras and video cameras, various projectors, and enlargers.

In addition, in the above embodiment, only the relationship between the camera body and the interchangeable lens was shown, but the intermediate ring, bellows, focusing unit, rear converter, etc. that are interposed between the camera body and the interchangeable lens, and the camera This invention is also effective between a body or an interchangeable lens, and can be applied to any focusing driving force transmission between interchangeable optical devices that are attached to and detached from each other. The side with the optical device is the main body of the optical device, and the side with the driven part is the replacement optical device.

Further, in the above embodiment, when an interchangeable lens is attached to the camera body, the drive direction of the drive section is automatically reversed by a signal corresponding to the drive direction of the interchangeable lens. However, as shown in FIGS. 13 to 16, for the interchangeable lens 101 in which the drive direction handivity is in a normal relationship and the interchangeable lens 102 in the opposite relationship, Displays 103 and 104 as visual signals corresponding to the driving direction are provided on a part of the outer surface, for example, a part of the front end surface and a part of the outer periphery of the rear end that are easy for the user to confirm, and the camera user can see the display 103°. 104, it is also possible to manually operate a drive direction forward/reverse switch 106 provided in a part of the camera body 105. In this case, the configuration is the simplest.

If the switch 106 is placed near the main switch 46 as shown in Figures 15 and 16, it will be easier to remind the user that the switch 106 needs to be operated when operating the main switch 46 to perform automatic focusing. , it is possible to prevent failures due to forgetting operations.

A signal indicating the drive direction of the driven part of each interchangeable lens 101, 102 is given to the camera body 105 side, and indicator lamps 107 and 108 are shown in FIG. It would be even more convenient if it was set up like this. And that indicator lamp 1
As shown in FIG.
If the switch 106 is placed near the switch 106, it will be constantly checked whether the switch 106 is switched to the proper side.

Effects According to the present invention, the driving direction of the driven part by the driving part provided in the optical equipment main body is adjusted according to the signal corresponding to the moving direction of the focusing part side of the exchangeable optical equipment attached to the optical equipment main body. Since the forward and reverse directions are reversed and the focus adjustment section is driven in the appropriate direction, the inability to focus can be resolved without unifying the driving direction of the focus adjustment section, and the above-mentioned drawbacks caused by unification can be avoided. be done. Furthermore, since the drive direction on the optical device body is reversed in order to drive the focus adjustment unit in the appropriate direction, it saves the time and effort of moving the photographic lens on a trial basis, making it very convenient for actual use. .

In addition, the replacement optical device only needs to be equipped with a signal corresponding to its drive direction, which does not cause a particularly high cost increase, and the optical device itself is driven in accordance with the signal from the replacement optical device. It is sufficient to have a means for switching the drive direction of the driven part by the part between forward and reverse directions, and it can be provided easily and inexpensively.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of one embodiment showing interchangeable lenses with different driven line drive directions attached to the camera body, and Figures 3 and 4 are each interchangeable lens of another embodiment. 5 is a sectional view of the main parts of the camera body used for the interchangeable lenses shown in Fig. 3 and 4, and Figs. 6 and 7 are
The figure is a cross-sectional view of the main parts of each interchangeable lens in other embodiments, the barrel 8 figure is a cross-sectional view of the main part of the camera body used in the interchangeable lenses shown in Figs. 6 and 7, and Fig. 9 is the motor rotation shown in Fig. 8. FIG. 10 is an electric circuit diagram showing a specific example of the direction switching circuit; FIGS. 1O and 11 are cross-sectional views of the main parts of each interchangeable lens in another embodiment; FIG. 12 is FIG. 10; Fig. 11 is an electric circuit diagram on the camera body side used in the interchangeable lens; Figs. 13 and 14 are overall perspective views and perspective views of the main parts of each interchangeable lens in another embodiment; and Fig. 15 is a camera body side electrical circuit diagram. A sectional view, FIG. 16 is a rear view of the main part of the camera body, and FIG. 17 is a rear view of the main part of the camera body of a modified example. 5.6... Focus detection means, 7.8.9.10.7-8
・82・90... Drive section, 24.25.34... Follower section, 23a-27aa29-29a*29b-focus adjustment section, 22.37, 42 & 421) 4204
2(1-43a 43b 430 43(1,53
& 53b-55a 55b. 85-86, 103/104...Signal means, 6-'3
g. 52.57・63,89.6・106...Reversing means applicant Minolta Camera Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 5 b Figure 4

Claims (1)

[Scope of Claims] (1) The focus detection means outputs a focus signal representing the focus direction and focus according to the focus state, and the focus point drive unit moves in the forward direction or In an automatic focusing method using an optical device main body that operates in opposite directions and a replacement optical device whose focus adjustment section is driven by a driven section that follows the drive section when attached to the optical device main body, the replacement optical device The relationship between the focus signal of the focus detection means in the optical device main body and the operating direction of the driving section is switched in accordance with a signal representing the driven direction of the focus adjustment section with respect to the operating direction of the driven section. (2) an automatic focusing method characterized in that the focus adjustment section of the replacement optical device is driven by the drive section of the optical device main body via the driven section; (2) the focusing drive section of the optical device main body; An automatic apparatus comprising: a driven part that is detachably connected; a focus adjustment part that is connected to the driven part; and a signal means that indicates the driven direction of the focus adjustment part with respect to the operating direction of the driven part. Replaceable optical device (3) used in the focusing method The signal means is a visual display to the outside of the replaceable optical device (4) The signal means according to claim 2 is the replaceable optical device The exchangeable optical equipment (5) signal means according to claim 2, which is a mechanical signal based on the dimensional or positional relationship to the optical equipment main body, partially transmits an electrical signal to the optical equipment main body. Replaceable optical device (6) according to claim 2 of the accompanying claim: focus detection means for outputting a focus signal representing a focus direction and focus according to a focus state; The present invention is characterized by comprising: a focusing drive section that operates in a direction and drives a driven section of an exchangeable optical device; and a drive direction reversing means that can selectively reverse the operating direction of the drive section with respect to a focus signal. The driving direction reversing means of the optical equipment main body (7) used in the automatic focusing method is provided so as to be manually operable. The optical instrument main body according to claim 6, wherein the operating direction of the drive unit with respect to a single focal point signal is automatically reversed in response to a mechanical or electrical external signal.